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fdt: Add binding decode function for display-timings

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This is useful for display parameters. Add a simple decode function to read
from this device tree node.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass
2015-04-14 21:03:21 -06:00
committed by Tom Warren
parent 962f5caf60
commit 12e671142d
3 changed files with 279 additions and 0 deletions
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92
lib/fdtdec.c
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@@ -1037,6 +1037,98 @@ int fdtdec_decode_memory_region(const void *blob, int config_node,
return 0;
}
static int decode_timing_property(const void *blob, int node, const char *name,
struct timing_entry *result)
{
int length, ret = 0;
const u32 *prop;
prop = fdt_getprop(blob, node, name, &length);
if (!prop) {
debug("%s: could not find property %s\n",
fdt_get_name(blob, node, NULL), name);
return length;
}
if (length == sizeof(u32)) {
result->typ = fdtdec_get_int(blob, node, name, 0);
result->min = result->typ;
result->max = result->typ;
} else {
ret = fdtdec_get_int_array(blob, node, name, &result->min, 3);
}
return ret;
}
int fdtdec_decode_display_timing(const void *blob, int parent, int index,
struct display_timing *dt)
{
int i, node, timings_node;
u32 val = 0;
int ret = 0;
timings_node = fdt_subnode_offset(blob, parent, "display-timings");
if (timings_node < 0)
return timings_node;
for (i = 0, node = fdt_first_subnode(blob, timings_node);
node > 0 && i != index;
node = fdt_next_subnode(blob, node))
i++;
if (node < 0)
return node;
memset(dt, 0, sizeof(*dt));
ret |= decode_timing_property(blob, node, "hback-porch",
&dt->hback_porch);
ret |= decode_timing_property(blob, node, "hfront-porch",
&dt->hfront_porch);
ret |= decode_timing_property(blob, node, "hactive", &dt->hactive);
ret |= decode_timing_property(blob, node, "hsync-len", &dt->hsync_len);
ret |= decode_timing_property(blob, node, "vback-porch",
&dt->vback_porch);
ret |= decode_timing_property(blob, node, "vfront-porch",
&dt->vfront_porch);
ret |= decode_timing_property(blob, node, "vactive", &dt->vactive);
ret |= decode_timing_property(blob, node, "vsync-len", &dt->vsync_len);
ret |= decode_timing_property(blob, node, "clock-frequency",
&dt->pixelclock);
dt->flags = 0;
val = fdtdec_get_int(blob, node, "vsync-active", -1);
if (val != -1) {
dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :
DISPLAY_FLAGS_VSYNC_LOW;
}
val = fdtdec_get_int(blob, node, "hsync-active", -1);
if (val != -1) {
dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :
DISPLAY_FLAGS_HSYNC_LOW;
}
val = fdtdec_get_int(blob, node, "de-active", -1);
if (val != -1) {
dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :
DISPLAY_FLAGS_DE_LOW;
}
val = fdtdec_get_int(blob, node, "pixelclk-active", -1);
if (val != -1) {
dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
DISPLAY_FLAGS_PIXDATA_NEGEDGE;
}
if (fdtdec_get_bool(blob, node, "interlaced"))
dt->flags |= DISPLAY_FLAGS_INTERLACED;
if (fdtdec_get_bool(blob, node, "doublescan"))
dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;
if (fdtdec_get_bool(blob, node, "doubleclk"))
dt->flags |= DISPLAY_FLAGS_DOUBLECLK;
return 0;
}
int fdtdec_setup(void)
{
#ifdef CONFIG_OF_CONTROL